Use settings' theme when inflating account prefs

When inflating account specific preferences, the settings style is
set so the inflated preferences have the same style.  If a different
theme, than the rest of the system, is set for Settings it is possible
for the inflated preference to try and reference a theme specific item
which won't be part of that apps resources, resulting in an
InflateException.  To avoid this we attach the themed resources that
are applied to settings to the newly created package context so that
those resources can be properly resolved.

Change-Id: I0cf0430db379b146fe80ce3173f050e5b120bbbb
TICKET: CYNGNOS-2318
(cherry picked from commit 3403e489)
(cherry picked from commit c9ddae03)